Let me start by saying that without YouTube the internet is incomplete.
You relate so many things with stuffs like search with gooogle.dictionary with oxford.similarly for videos.only one name comes to mind is Youtube.
The new feature added by Youtube of downloading and viewing videos is also a very good feature so that you dont need to buffer stuffs.
Youtube has helped people at all levels.from kids to their educational stuffs and project works.to housewives for cooking or learning any new stuffs.to men or women to groom themselves.
You can search for anything in youtube and you will get the related videos.
Things made easy by YOUTUBE.